Concrete-mixer.



UNTTED STATES PATENT OFEICE.

PHILIP A. KOEHRIN, 0F MILWAUKEE, WISCONSIN, ASSIGNOR T0 KOEHRING MACHINE COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

CONCRETE-MIXER Specication of Letters Patent.

vApplication Med December 1, 1914. Serial No. 875,027.

To all whom 'it may concern:

Beit known that I, PHILIP A. KOEHRING, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Concrete- Mixers, of which the following is a specication.

This invention appertains to the art of concrete mixing machines and comprises primarily a small type mixer of novel construction. By a small type mixer is meant a. machine capable of mixing comparatively small batches of cement sand, and other materials treated in machines of this sort, the primary object of the present improvements having been to devise a machine of the utmost simplicity whereby it may be manufactured and marketed at low cost, a machine which will be very effective in so far as its mixing functions are concerned, and one which, notwithstanding its simplicity and cheapness of structure, is possessed of all the requisites of substantiality and wear and tear resisting qualities whichy machinesk for the particular purpose must have in view of the hard usage to which they are ordinarily subjected.

In carrying out the invention, it is contemplated to mount the mixing instrumentalities upon a. portable truck which carries a framework on which a mixing drum is rotatably supported, the means fior mounting the drum in position and holding the same for ready rotation forming an essential feature of the improvements, together with special means provided for the purpose of facilitating the mixing action and discharging the contents of the drum of the mixing receptacle, all of which will be fully understood upon reference to the accompanying detailv description and to the appended drawings, in which:

Figure 1 is a side view of a, mixer embodying the invention. Fig. 2 is a plan view of the same. Fig. 3 is a side elevation looking toward the discharge end of the mixing drum; and Fig. 4 is a transverse sectional view bringing out more clearly the. means supporting the drum for rotation and the mixing and discharge chute with operating devices. Fig. 5 of the drawing illustrates a modified form of means for supporting the drum to rotate about its axis.

Throughout the following detail description, and on the several figures of the dra 1ngs, similar parts are referred to by lil reference characters.

The truck illustrated in the drawings as carrying the mixing mechanism of the invention is made of any conventional ty and preferably merely com rises the bog; A mounted upon the round) wheels B, an suitable draft means icing connected with the front end of the truck and the front wheels B being susceptible of being turned for steering purposes, if desired. On the body A of the truck is arranged a vertical framework C composed of suitable uprights C, horizontal members 0' and crossed braces C' that will be observed in Fig. 2 of the drawings. The framework C is disposed at one end of the truck A and adjacent to the opposite end will preferably be arranged a motor 1 of any common type, such as an explosive engine, suitable driving means being provided intermediate said motor and the mixing drum 2 mounted on the framework C, and including the drive gears 3 and 4, the latter gear meshing with the teeth vof a gear ring 5 connected with the drum 2. Any suitable clutch means may be utilized whereby to interrupt and establish the driving connection between the engine 1 and the drum 2. and since this means is not material within the contemplation of the present invention, the same is not described in detail.

The means to supportl the drum 2 on the framework C comprises a bracket or support of approximately V-form, designated G, and seen best in Figs. 1 and 4 of the drawings, said bracket having the upwardly divergent arms thereof secured in any substantial manner to the upper end of the framework C. The lower portion of the bracket 6 is curved sufliciently to partially enter the charging opening 7 at one end of the drum 2 and is formed with a bearing S iu which is mounted the journal member il pinned or otherwise secured to said bearing as shown at 10. The journal member i) projects quite a little distance int: the drum 2 and mounted to rotate freshY w the projecting portion is a sleeve-lik. inmnher constituting a hub 11 of a *vider l?. the latter consisting of radialing arm# as usual, said arms being formed integr-Vl at their outer terminals with the gear ring 5,

It will be seen from the foregoing, that Patented Mar. 28, 1916.

the drum 2 is supported therefore upon the jcurnal member 9 and is free to rotate with said journal member as its axis, during the opcratirm of thc driving means connecting said drums with the engine 1. Displace nir-nty of the drum 2 from the axial support of the same is prevented by means of a plate 13 attached to the inner end of the member ff) by screw 1l, the plate being ot' sullicient diameter to overlap the innermost portion ot' the hub 11 and thus hold the drum 2 in operative position. In order to protecty the securing ,means .lil-11i a cap 15 is fastened to the inner end ot' the hub 11 so as to house the portions of the parts 13-11 which mould brothcrwise exposed, and contact ol' the materials mixed in the receptacle 2, with the parts 13 and 14 is prevented in this way. 'The cap 15 is secured to the member' 11 by any suitable fastenings.

The drum 2 is preferably made in sections including end sectionsl 1G and a middle section 1T one of the end sections 1G and the middle section 17 being connected together by means of the spider 12 owing to the fact that the gear ring,r 5 forming a part of said Spider has the lateral flanges 5 riveted or otherwise 'secured to the particular parts of the drum just referred to. The radiating arms comprising the member 12 incline slightly toward the center ot the drum, the mounting of the latter so far as stability is concerned being subserved by the above feature oi construction. and the fact that the support about which the drum revolves proreceptacle is practicable having` in view the mixing function of the drum.

Interiorly the drum 2 will, of course, be provided 'with suitable mixing buckets 18 and a stationary charging chute 19 is located at the inlet end of the drum and suitably secured at opposite portions thereof, to the adjacent uprights C' of the framework C. 1t is desirable since the materials to be mixed are introduced into the drum at the end adjacentto the supporting bearing or hub 11 to protect these parte from wear incidental not only to the introduction ol the said material or incident tothe mixing ot' the materials after being received in tho receptacle 2. For the above purpose a guard 20 is provided and consists ot' a casing inclosing the portion of the hub 11 intermediate the arms of the spider 12 and the bearing 8 of the bracket 6.

At its discharging end, the drum 2 is provided with the usual opening for discharge purposes and a reversibly inclinable chute 21 is pivoted at 22 to brackets proiecting in'- ward from certain uprights of the framework C. The chute 21 is manually operable by means of the provision of a shaft 23 mounfelin bearings on the framework C, said Jett having arms 24 connected by Jects as near to the center of gravity of the links 25 with the outer portion of the chute 21. By manipulation of a handle or lever 26 at one end of the shaft 23. the arms 24 may be raised or lowered and when raised the links 25 will be lifted to move the chute 21 to a position in which it inclines downward into the drum 2. 1n such position the chute cooperates in the mixing operation to carry the mixed materials back toward the inlet or charging end ot' the drum. The chute 21 is furthermore held in the position just mentioned, as seen in dotted lines in Fig. 1, by vdie provision of curved ends or hooks 25 on the upper portions of the links 25, said portions adapted to engage over the shaft 23 and sustain the chute at the adjustment referred to. WVhen the chute is inclined in a reverse manner, as seen by full lines in Fig. 4, the mixed materials carried upward by the buckets 18 of the drum are permitted to fall into the chute and are thus discharged therefrom into a suitable receptacle or the like.

1t' desired, a suitable casing may be provided for the engine 1, this matter not being essential to the invention, however, since any driving means whatever may be utilized for the drum 2.

In Fig. 5 of the drawings, there is illustrated a modilieation ofthe invention in re spect to the means employed for supporting the mixing drum for rotation about its axis. In this construction, the journal member 9a is carried by the spider 12 being keyed or otherwise secured to the central portion of the latter and fits into the opening at the lower end of the bracket G, said opening forming a bearing in which the journal member is free t0 rotate. The securing means to prevent displacement of the journal member from its bearing is located in the modified construction at the outer end of the journal member instead of at its inner end as shown in Fig. 4. Said securing means includes a nut or collar 13n over which fits the cap 15 affording a housing for said member 13 and held in place by any suitable fastening device. The casing element shown at 20 in Fig. 4 is equivalent to the hollow casing extension 20l seen in Fig. 5, the part 2()a being preferably integral 'with the spider 1,21 at the hood portion of the latter and overlapping the bearing portion of the bracket 6a which is formed with a groove shown at (lb in which that portion of the extension 20 uppermost during the rotation of the drum operates. The member 2()a is effective to prevent the materials mixed in the drum from in any way interfering with the bearing for the member 9. Either of the methods described for mounting the drum upon the bracket supporting the same may be emploved within the purview of the invention. It is contemplated to utilize the spider 12 Lingus or 12a as the case may be to perform a fune-- tion additional to those previously ascribed thereto, namelyias a means to support cer tain of the mixingr blades 18 in the drinn 2, Such blades being riveted or otherwise secured to the arms of the spider adjacent to the outer ends of the latter.

Havingv thus described my invention, what I claim as nenY is:

l. In a mixingy machine, the con'ibination 0f a drum having an end opening. mixing devices in said drinn. a support for the drain comprising a frameworkv` a bracket carried by the framework and terminating adjacent to said end opening;r of the drum, a Aionrnai member carried by said bracket, and projecting into the end openingr of the drinn, means snpportiing` the drinn and having a bearing to receive Said journal member, and a casing surrounding; said bearing;r for preventing materials mixed in the drinn from wearing upon the bearing.

2 In a mixing; maf-bine. the Combination of a drum having an end opening, a sup port for the drinn comprising a framework, a bracket carried by the framework and terminating adjacent to said end opening of the drinn, a jonrnal member carried by said bracket. and prejecting into the end opening of the drinn. means snpiiiorting the drinn on said jonrnai' member comprising a spider attached at' its enter portion to the drinn anci supported at its inner portion by the journal member, mixing; members Connected with the drinn and spider, and a easing." between said bracket and the spider extending aronnd the journal. member for the purpose described.

in testimony whereof I ailix my signature in presence of two witnesses.

PHHP A. KUEHRING.

"itnesses t .lwALn hifizniaiizian, VM. L. F. CoLnnAN. 

